By His stripes we are healed. – Isaiah 53:5
For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul. Leviticus 17:11
For Christ also hath once suffered for sins, the just for the unjust, that He might bring us to God, being put to death in the flesh, but quickened by the Spirit… – 1 Peter 3:18
Remember that the sufferings of Christ were vicarious. He stood in our place that we might stand in His place. He took our sin upon Himself and, being found with that sin upon Him, He was made to bear the penalty that was due to it. And He did bear it—and this is the way whereby we are healed—by Jesus Christ, Himself, taking our infirmities and bearing our sicknesses. This Doctrine of Substitution is the grandest of all Truths of God and though all these years I have continued to preach nothing else but this, what better news can I tell a poor sinner than that the Savior has taken his sins and borne his sorrows for him? Take away the Doctrine of the Substitutionary Sacrifice of Christ and you have torn out the very heart of the Gospel! “The blood is the life thereof” and you have no living Gospel to preach if Atonement by blood is once put into the background! But, O poor Soul, if you believe that Jesus is the Christ and that Christ took your sins and bore them in His own body on the tree where He died, “the Just for the unjust, to bring us to God,” you are saved, and saved forever!
Does someone enquire, “How am I to get this Atonement applied to my soul?” …If you believe on Jesus Christ—if you will accept the testimony of God concerning His Son whom He has set forth to be the Propitiation for sin—and rely upon Him, alone, for salvation, you shall be saved! …Trust yourself with Him who died for you, and you are saved! And, continuing to trust Him, you shall daily feel the power of His expiation, the marvelous healing that comes by His stripes! Repentance is the first symptom of that healing. When the proud flesh begins to yield; when the wretched gathering commences to break and the soul that was formerly swollen through trying to conceal its sin bursts with confession and acknowledgment of its transgression— then is it being healed by the stripes of Jesus! This is God’s wondrous remedy for the soul-sickness of sin! ~ C.H. Spurgeon
https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2499.cfm